Looper-actuating mechanism.



A. H. DE VOE. LOOPER AGTUATING MECHANISM. APPLIOATIONTILED JAN. 30, 1912.

1,100,124, I Patented June 16, 1914.

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UNITED STATES PATENT ()FFICE.

ALBERT I-I. DE VOE, 0E WESTFIELD, NEW JERSEY, ASSIGNOR TO THE SING-ER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

LOOPER-ACTUATING MECHANISM.

Specification of Letters Patent.

Patented J une 16, 1914.

To all whom it may concern Be it known that I, ALBERT I-I. Dn Von, a citizen of the United States, residing at VVestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Looper-Actuating Mechanisms, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a looper-actuating mechanism which will be simple in construction and durable in operation and which will impart operative movements to the looper with the utmost precision.

According to the invention a rocking element derives directly from the main-shaft oscillatory movements upon two transversely arranged axes and is operatively connected with a looper-carrier movable in different directions in angular relation with each other.

In the preferred form of the improve- -ment, the main-shaft is provided with an inclined crank which is embraced by a sleeve of the rocking element which has a crankpin in angular relation with said sleeve embraced by a sleeve or tubular hub of the looper-carrier which is mounted to rock and slidevupon an axis transverse to its sleeve or tubular hub.

In the accompanying drawings, Figure 1 is a sectional side elevation of a doublechain-stitch machine constructed substantially in accordance with the United States patent to V. H. I-Iugg No. 1,005,645, of October 10, 1911, but embodying the looper mechanism of the present invention; and Fig. 2 a front elevation of the lower portion of the same. Fig. 3 is a side elevation of the forward section of the main-shaft provided with the inclined crank-pin; Fig. 4 an oblique view of the rocking element fitted upon and sustained by such crankpin, and Fig. 5 a perspective view of the looper-carrier. Fig. 6 is a side elevation of the main-shaft extension.

The machine is shown constructed with the usual base 1 and bracket-arm comprising the hollow upright portion 2 and over hanging member 3 in the head 4: of which is journaled the vertically reciprocating needle-bar 5 carrying the needle 6. The longitudinally arranged main or driving shaft 7 is journaled in suitable bearings 8 in the base 1 beneath the work-plate 9 in intersecting relation with the needle-path, as clearly indicated in the drawings, and is provided near its rearward end with an ac-' tuatmg crank 10 and carries the usual pul ley 11 by means of which it is driven. The needle-actuating rock-shaft 12 is journaled within and longitudinally of the overhanging bracket-arm and carries at its forward end the crank-arm 12 connected by means of the usual link 13 with a stud carried by the collar 1 1 fixed upon the needle-bar 5, from which connect-ions the needle receives its operative movements from the rock-shaft 12, which has fixed upon its rearward end the crank-arm 15 connected with the upper end of a pitman-rod 16 whose lower end embraces the crank 10 of the driving shaft.

As indicated in dotted lines in Fig. 1, the forward end of the driving shaft 7 is made tubular to receive the crank section 7* which is secured therein by means of the set-screw 17 The crank-section 7 is formed with a head 18 from whose inclined forward face projects the inclined looper-actuating crankpin 19. Fitted upon the crank-pin 19 is the hollow hub or sleeve 20 constituting the body of the rocking element and having intermediate its ends the laterally extending crank-pin 21. The crank-pin 21 of the rocking member is fitted within the tubular hub or sleeve 22 formed at one extremity of the curved body of the looper-carrier 23 which is formed at its opposite extremity with the socket 24 for reception of the shank of the looper 25 which is secured therein by means of the set-screw 26. Intermediate its ends the carrier-body is provided with a laterally extending stud or journal-pin 27 disposed in angular relation with the sleeve 22 and fitted to oscillate and slide endwise in the fixed transverse bearing 28 of the base 1. As will be observed, the looper-carrier is supported by means of its journal-pin 27 within the bearing 28 of the frame, while the rocking member intermediate the loopercarrier and the driving shaft is sustained by the inclined crank-pin of the latter.

In order to steady the forward end of the shaft 7 an extension 7, which is ournaled in a suitable bearing 28 of the frame, is provided with a laterally oifset member 29 formed on its inclined rearward face with a transverse rib 3O fitted within a corresponding groove 31 in the adjacent extremity of the crank 19 to which the member 29 is secured by means of the screw 32 entering a threaded aperture 33 in said crank.

The crank-pin 19 is so positioned that its axis intersects that of the main-shaft. The axis of the journal-pin 27 constitutes the axis of motion of the looper-carrier and is arranged in substantially intersecting relation with the axis of the main-shaft and slightly in advance of the intersection of the latter with the aXisof the actuating crank 19. By this means, the rotation of the actuating crank-pin causes the tilting of the rocking element 20, 21 upon the axis of the pin 27, while its oscillation upon the axis of the pin 21, slightly rearward of the axis of oscillation of the looper-carrier causes the latter to receive slight sidewise movements in the direction of its axis of motion. As will be evident, the distance apart of the intersections of the axial lines of the crank pin 19 and journal-pin 27 with that of the main-shaft serves to determine the length of side throw or needle-avoiding movement of the looper-carrier and the looper mounted thereon. The looper-blade is shown disposed transversely tothe journal-pin 27 and in or parallel with a vertical plane embracing the axis of the driving shaft, in which relation it remains in its endwise and sidewise movements derived from the crankelement 19. The other parts of the threadhandhng means and the feeding mechanism are or may be constructed and arranged as 35" described in the United States patent to W. Ht Hugg before mentioned, but they form no portion of the present invention.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a looper mechanism, the combination with a shaft provided with an actuatmg member, of a looper carrier movable in different directions in angular relation with each other, a looper mounted thereon and having a blade confined to parallelism with a fixed plane, and a rocking element connected with said. actuating member and oscillating upon substantially intersecting axes and having a connection with the looper-carrier from which exclusively the latter derives its said movements in different directions.

2. In a loo-per mechanism, the combination with an actuating shaft, of a looper having a loop-seizing blade, a looper-carrier movable in two directions respectively lengthwise and crosswise of said blade and confined against movement in all other directions, a fixed supporting bearing for said looper-carrier arranged transversely of, adjacent to and in intersecting relation with said shaft, and a rocking element adapted for oscillation upon substantially intersecting axes and connected with said shaft from which it derives operative movements and by which it is sustained.

3. In a looper mechanism, the combination with an actuating shaft provided with an inclined crank-pin, of a looper-carrier mounted for oscillatory movement upon and for bodily movement along a fixed axis, and a connection between said shaft and loopercarrier comprising an element sleeved upon said crank-pin and having a piirand-sleeve connection with the looper-carrier.

4. In a looper mechanism, the combination. with an actuating shaft provided with an inclined crank-pin, of a looper-carrier mounted to oscillate and slide upon an axis transverse to that of the shaft and formed with a sleeve transverse to its axis of motion, a looper mounted upon said carrier and having a blade disposed transversely to the direction of sliding movement of the carrier upon said axis, and a rocking clement loosely mounted upon said crank-pin and having a pin-and-sleeve connection with the loopercarrier.

5. In a sewing machine, the combination with a reciprocating needle and a shaft hav ing its axis disposed in substantially intersecting relation with the path of reciprocation of said needle and provided with an inclined crank-pin, of a looper cooperating with said needle and having a blade movable endwise in an arcuate path upon an axis transverse to said shaft, and an element sleeved upon and supported by said crank-pin and having with said looper-earrier a pivotal connection upon an axis intersecting that upon which the looper-earrier oscillates.

6. In a looper mechanism, the combination with a shaft provided with an inclined crank-pin, of a loo1: er-carrier mounted to perform oscillating and bodily sidewise movements, and a member sleeved upon said crank-pin and having a sliding and pivotal connection with the looper-carrier and adapted to impart to the latter its operative movements.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT H. DE VOE.

Witnesses:

HENRY J. MILLER, H. A. KORNEMANN, J r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

